9999*2222+3333*3334=9999*2222+3333*(3333+1)=9999*2222+1111*(9999+3)=9999*(2222+1111)+1111*3=9999*3333+3333=(9999+1)*3333=10000*3333=33330000
9999乘以2222加上3333乘以3334用简便方法计算
9999*2222+3333*3334=9999*2222+3333*(3333+1)=9999*2222+1111*(9999+3)=9999*(2222+1111)+1111*3=9999*3333+3333=(9999+1)*3333=10000*3333=33330000